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危岩崩塌是一种常见且破坏性极大的地质灾害,而地震是导致危岩崩塌的主要因素之一。数值模拟是研究危岩崩塌的重要手段。以概念危岩为例,运用非连续变形分析(DDA)法研究了地震荷载对危岩体崩塌块体运动特性的影响。对无地震荷载和3种不同地震荷载输入方式的4种工况进行了模拟。研究结果表明:地震荷载对危岩崩塌破坏有促进作用,不同的地震荷载输入方式对崩塌块体的运动特性有着显著的差异。从算例来看,竖向地震动对崩塌块体运动距离的影响程度甚至比水平地震动对其的影响程度更大,这与人们的传统观念不同,在今后的地震危岩崩塌防治措施设计中,应对竖向地震荷载给予足够的重视。
Dangerous rock collapse is a common and devastating geological disasters, and the earthquake is one of the main factors leading to the collapse of dangerous rock. Numerical simulation is an important method to study the collapse of dangerous rock. Taking the concept of dangerous rock as an example, the influence of seismic load on the motion characteristics of the collapsed block in dangerous rock mass was studied by the method of discontinuous deformation analysis (DDA). Four kinds of working conditions with no earthquake load and three kinds of different earthquake load input modes were simulated. The results show that: the seismic load can promote the collapse of the dangerous rock, and the different earthquake load input modes have significant differences on the motion characteristics of the collapsed block. From the example, the influence of vertical ground motion on the movement distance of the collapse block is even more affected than the horizontal ground motion, which is different from people’s traditional concept. In the future, , Should pay enough attention to vertical seismic load.